A new study suggests that narwhal tusk size is indicative of testicle size and fertility.
Narwhals' tusks, which are actually single teeth atop their heads, are directly correlated to teste mass, researchers found. The study, published this month in Marine Mammal Science, looked at more than 100 narwhals from Inuit hunts in the Canadian Arctic between 1990 and 1998. The researchers found that longer tusks were indicative of larger testicles.
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